Fuse Lenses for Spy Optic Dirk Plastic frame Plastic lens Non-polarized lenses Lens width: 64 millimeters Fuse Brown Tinted Lenses. Brown tint heightens color contrast. Non-Polarized Completely block harmful UV rays, providing 100% UV protection Fuse Force scratch resistant hard coating Lens Category 3, Ideal for Bright Light Custom Made to easily interchange with your current sunglasses.